在postgresql中提取并平均时态数据库中的instintanous值 [英] Extracting and Averaging instintanous values in temporal DB in postgresql

问题描述

我有一个临时数据库，我想对这些数据进行平均：`

  HH =（HH-例如：
 
 13 =观察期12:41至13:40。 
预期结果：
 
 
代码应该从（HH-1）：41中减去HH：40的瞬时值。
 
 
 
样本数据： 
 
 
 温度日期 - 时间
 1 -1.64 2007-09-29 00:01:09 
 2 -1.76 2007-09-29 00:03:09 
 3 -1.83 2007-09-29 00:05:09 
 4 -1.86 2007-09- 29 00:07:09 
 5 -1.94 2007-09-29 00:09:09 
 6 -1.87 2007-09-29 00:11:09 
 7 -1.87 2007-09 -29 00:13:09 
 8 -1.80 2007-09-29 00:15:09 
 9 -1.64 2007-09-29 00:17:09 
 10 -1.60 2007- 09-29 00:19:09 
 11 -1.90 2007-09-29 00:21:09 
 12 -2.08 2007-09-29 00:23:09 
 13 -1.94 2007 -09-29 00:25:09 
 14 -2.12 2007-09-29 00:27:09 
 15 -1.87 2007-09-29 00:29:09 
 16 -2.18 2007-09-29 00:31:09 
 17 -1.98 2007-09-29 00:33:09 
 18 -1.73 2007-09-29 00:35:09 
 19  - 1.84 2007-09-29 00:37:09 
 20 -2.04 2007-09-29 00:39:09 
 21 -1.86 2007-09-29 00:41:09 
 22 -1.94 20 07-09-29 00:43:09 
 23 -1.77 2007-09-29 00:45:09 
 24 -1.78 2007-09-29 00:47:09 
 25  - 1.50 2007-09-29 00:49:09 
 26 -1.46 2007-09-29 00:51:09 
 27 -1.72 2007-09-29 00:53:09 
 28 -1.67 2007-09-29 00:55:09 
 29 -1.56 2007-09-29 00:57:09 
 30 -1.69 2007-09-29 00:59:09 
 31 -1.97 2007-09-29 01:01:09 
 32 -1.79 2007-09-29 01:03:09 
 33 -1.79 2007-09-29 01:05:09 
 34 -1.84 2007-09-29 01:07:09 
 35 -1.91 2007-09-29 01:09:09 
 36 -1.87 2007-09-29 01:11:09 
 37 -1.98 2007-09-29 01:13:09 
 38 -1.83 2007-09-29 01:15:09 
 39 -1.88 2007-09-29 01:17:09 
 40 -1.88 2007-09-29 01:19:09 
 41 -1.78 2007-09-29 01:21:09 
 42 -1.78 2007-09-29 01:23:09 
 43 -1.66 2007-09-29 01:25:09 
 44 -1.70 2007-09-29 01:27:09 
 45 -1.46 2007-09-29 01:29： 09 
 46 -1.36 2007-09-29 01:31:09 
 47 -1.40 2007-09-29 01:33:09 
 48 -1.34 2007-09-29 01:35 ：09 
 49 -1.34 200 7-09-29 01:37:09 
 50 -1.30 2007-09-29 01:39:09 
 51 -1.36 2007-09-29 01:41:09 
 52  - 1.40 2007-09-29 01:43:09 
 53 -1.43 2007-09-29 01:45:09 
 54 -1.38 2007-09-29 01:47:09 
 55 -1.40 2007-09-29 01:49:09 
 56 -1.42 2007-09-29 01:51:09 
 57 -1.47 2007-09-29 01:53:09 
 58 -1.66 2007-09-29 01:55:09 
 59 -1.84 2007-09-29 01:57:09 
 60 -1.92 2007-09-29 01:59:09 
 61 -1.88 2007-09-29 02:01:09 
 62 -2.11 2007-09-29 02:03:09 
 63 -1.91 2007-09-29 02:05:09 
 64 -2.04 2007-09-29 02:07:09 
 65 -1.94 2007-09-29 02:09:09 
 66 -1.92 2007-09-29 02:11:09 
 67 -1.80 2007-09-29 02:13:09 
 68 -1.74 2007-09-29 02:15:09 
 69 -1.74 2007-09-29 02:17:09 
 70 -1.76 2007-09-29 02:19:09 
 71 -1.74 2007-09-29 02:21:09 
 72 -1.80 2007-09-29 02:23： 09 
 73 -1.80 2007-09-29 02:25:09 
 74 -1.80 2007-09-29 02:27:09 
 75 -1.82 2007-09-29 02:29 ：09 
 76 -1.90 2007 -09-29 02:31:09 
 77 -1.93 2007-09-29 02:33:09 
 78 -2.06 2007-09-29 02:35:09 
 79 -2.08 2007-09-29 02:37:09 
 80 -1.95 2007-09-29 02:39:09 
 81 -1.98 2007-09-29 02:41:09 
 82  - 2.32 2007-09-29 02:43:09 
 83 -1.86 2007-09-29 02:45:09 
 84 -1.97 2007-09-29 02:47:09 
 85 -1.64 2007-09-29 02:49:09 
 86 -2.00 2007-09-29 02:51:09 
 87 -1.48 2007-09-29 02:53:09 
 88 -1.74 2007-09-29 02:55:09 
 89 -1.85 2007-09-29 02:57:09 
 90 -1.82 2007-09-29 02:59:09 
 91 -1.82 2007-09-29 03:01:09 
 92 -1.92 2007-09-29 03:03:09 
 93 -1.80 2007-09-29 03:05:09 
 94 -1.54 2007-09-29 03:07:09 
 95 -1.36 2007-09-29 03:09:09 
 96 -1.50 2007-09-29 03:11:09 
 97 -1.59 2007-09-29 03:13:09 
 98 -1.60 2007-09-29 03:15:09 
 99 -1.58 2007-09-29 03:17:09 
 100 -1.81 2007-09-29 03:19:09 
 101 -2.16 2007-09-29 03:21:09 
 102 -1.97 2007-09-29 03:23： 09 
 103 -1.94 2007- 09-29 03:25:09 
 104 -2.29 2007-09-29 03:27:09 
 105 -2.46 2007-09-29 03:29:09 
 106 -2.42 2007 -09-29 03:31:09 
 107 -2.34 2007-09-29 03:33:09 
 108 -2.38 2007-09-29 03:35:09 
 109 -2.44 2007-09-29 03:37:09 
 110 -2.28 2007-09-29 03:39:09 
 111 -2.24 2007-09-29 03:41:09 
  
此外，date_time列采用时间戳格式。 
平均值不应该是移动平均值，我对简单平均值感兴趣。
 
 
 
 Coloroaldo建议的代码：
 
 
 选择
提取（小时从n25.dt）为小时，
 n25.dt为t1，n25.dt为t0，
 round （（（（n25.ambtemp + n25.ambtemp）/ 2）:: numeric，2）作为平均
从
 t0 
内部连接
 t1在
 date_trunc（ 'minute'，t0.dt + interval'1小时 -  2分钟'）
 = date_trunc（'minute'，t1.dt）
其中extract（分钟来自t1.dt）= 41 
 order by t1.dt 
  
 
 
解决方案
 
 选择
提取（小时从t1.dt）为小时，
 t1.dt为t1，t0.dt为t0，
 round（（（t0.ambtemp + t1。 / 2）:: numeric，2）作为平均
从
 n25 t0 
内部连接
 n25 t1在
 date_trunc（'minute'，t0.dt +间隔'1小时 -  2分钟'）
 = date_trunc（'分钟'，t1.dt）
 （从t1.dt开始的分钟数）= 41 
 order by t1.dt 
  
 < a href =http://www.sqlfiddle.com/#!12/8e1e4/2 =nofollow> SQL小提琴 
 
I have a temporal database and I wanted to average the data with respect to the: `
HH  = (HH-1):41 - HH:40
For example: 

13 = observation period 12:41 to 13:40. 
Expected results:

The code should subtract the instantaneous value of HH:40 from (HH-1):41.

Sample data:
    temperature      date-time
1     -1.64 2007-09-29 00:01:09
2     -1.76 2007-09-29 00:03:09
3     -1.83 2007-09-29 00:05:09
4     -1.86 2007-09-29 00:07:09
5     -1.94 2007-09-29 00:09:09
6     -1.87 2007-09-29 00:11:09
7     -1.87 2007-09-29 00:13:09
8     -1.80 2007-09-29 00:15:09
9     -1.64 2007-09-29 00:17:09
10    -1.60 2007-09-29 00:19:09
11    -1.90 2007-09-29 00:21:09
12    -2.08 2007-09-29 00:23:09
13    -1.94 2007-09-29 00:25:09
14    -2.12 2007-09-29 00:27:09
15    -1.87 2007-09-29 00:29:09
16    -2.18 2007-09-29 00:31:09
17    -1.98 2007-09-29 00:33:09
18    -1.73 2007-09-29 00:35:09
19    -1.84 2007-09-29 00:37:09
20    -2.04 2007-09-29 00:39:09
21    -1.86 2007-09-29 00:41:09
22    -1.94 2007-09-29 00:43:09
23    -1.77 2007-09-29 00:45:09
24    -1.78 2007-09-29 00:47:09
25    -1.50 2007-09-29 00:49:09
26    -1.46 2007-09-29 00:51:09
27    -1.72 2007-09-29 00:53:09
28    -1.67 2007-09-29 00:55:09
29    -1.56 2007-09-29 00:57:09
30    -1.69 2007-09-29 00:59:09
31    -1.97 2007-09-29 01:01:09
32    -1.79 2007-09-29 01:03:09
33    -1.79 2007-09-29 01:05:09
34    -1.84 2007-09-29 01:07:09
35    -1.91 2007-09-29 01:09:09
36    -1.87 2007-09-29 01:11:09
37    -1.98 2007-09-29 01:13:09
38    -1.83 2007-09-29 01:15:09
39    -1.88 2007-09-29 01:17:09
40    -1.88 2007-09-29 01:19:09
41    -1.78 2007-09-29 01:21:09
42    -1.78 2007-09-29 01:23:09
43    -1.66 2007-09-29 01:25:09
44    -1.70 2007-09-29 01:27:09
45    -1.46 2007-09-29 01:29:09
46    -1.36 2007-09-29 01:31:09
47    -1.40 2007-09-29 01:33:09
48    -1.34 2007-09-29 01:35:09
49    -1.34 2007-09-29 01:37:09
50    -1.30 2007-09-29 01:39:09
51    -1.36 2007-09-29 01:41:09
52    -1.40 2007-09-29 01:43:09
53    -1.43 2007-09-29 01:45:09
54    -1.38 2007-09-29 01:47:09
55    -1.40 2007-09-29 01:49:09
56    -1.42 2007-09-29 01:51:09
57    -1.47 2007-09-29 01:53:09
58    -1.66 2007-09-29 01:55:09
59    -1.84 2007-09-29 01:57:09
60    -1.92 2007-09-29 01:59:09
61    -1.88 2007-09-29 02:01:09
62    -2.11 2007-09-29 02:03:09
63    -1.91 2007-09-29 02:05:09
64    -2.04 2007-09-29 02:07:09
65    -1.94 2007-09-29 02:09:09
66    -1.92 2007-09-29 02:11:09
67    -1.80 2007-09-29 02:13:09
68    -1.74 2007-09-29 02:15:09
69    -1.74 2007-09-29 02:17:09
70    -1.76 2007-09-29 02:19:09
71    -1.74 2007-09-29 02:21:09
72    -1.80 2007-09-29 02:23:09
73    -1.80 2007-09-29 02:25:09
74    -1.80 2007-09-29 02:27:09
75    -1.82 2007-09-29 02:29:09
76    -1.90 2007-09-29 02:31:09
77    -1.93 2007-09-29 02:33:09
78    -2.06 2007-09-29 02:35:09
79    -2.08 2007-09-29 02:37:09
80    -1.95 2007-09-29 02:39:09
81    -1.98 2007-09-29 02:41:09
82    -2.32 2007-09-29 02:43:09
83    -1.86 2007-09-29 02:45:09
84    -1.97 2007-09-29 02:47:09
85    -1.64 2007-09-29 02:49:09
86    -2.00 2007-09-29 02:51:09
87    -1.48 2007-09-29 02:53:09
88    -1.74 2007-09-29 02:55:09
89    -1.85 2007-09-29 02:57:09
90    -1.82 2007-09-29 02:59:09
91    -1.82 2007-09-29 03:01:09
92    -1.92 2007-09-29 03:03:09
93    -1.80 2007-09-29 03:05:09
94    -1.54 2007-09-29 03:07:09
95    -1.36 2007-09-29 03:09:09
96    -1.50 2007-09-29 03:11:09
97    -1.59 2007-09-29 03:13:09
98    -1.60 2007-09-29 03:15:09
99    -1.58 2007-09-29 03:17:09
100   -1.81 2007-09-29 03:19:09
101   -2.16 2007-09-29 03:21:09
102   -1.97 2007-09-29 03:23:09
103   -1.94 2007-09-29 03:25:09
104   -2.29 2007-09-29 03:27:09
105   -2.46 2007-09-29 03:29:09
106   -2.42 2007-09-29 03:31:09
107   -2.34 2007-09-29 03:33:09
108   -2.38 2007-09-29 03:35:09
109   -2.44 2007-09-29 03:37:09
110   -2.28 2007-09-29 03:39:09
111   -2.24 2007-09-29 03:41:09
Moreover date_time column is in timestamps format. 
Average should not be moving average and I am intrested in simple average.

The proposed code by Coloroaldo:
select
    extract(hour from n25.dt) as hour,
    n25.dt as t1, n25.dt as t0,
    round(((n25.ambtemp + n25.ambtemp) / 2)::numeric, 2) as average
from
     t0
    inner join
     t1 on
        date_trunc('minute', t0.dt + interval '1 hour - 2 minutes')
        = date_trunc('minute', t1.dt)
where extract(minute from t1.dt) = 41
order by t1.dt

解决方案
select
    extract(hour from t1.dt) as hour,
    t1.dt as t1, t0.dt as t0,
    round(((t0.ambtemp + t1.ambtemp) / 2)::numeric, 2) as average
from
    n25 t0
    inner join
    n25 t1 on
        date_trunc('minute', t0.dt + interval '1 hour - 2 minutes')
        = date_trunc('minute', t1.dt)
where extract(minute from t1.dt) = 41
order by t1.dt
SQL Fiddle

                        
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